Grinding machine



April 17, 192s. 1,666,313

o. sANN I GRINDING MACHINE OTTO .56m/Af,

invento O. SANN GRINDING MACHINE April 17, 1928.

Filed March 28, 1925 5 Sheets-Sheet Inv/enfer 6 O. SANN GRINDING MACHINE `April 17, 1928.

Filed March 28, 1925 5 Sheets-Sheet 3 r., ,n m5 mm JWM@ April 17, 192s. .1,666,313 O. SANN I @BINDING umnm Filed March 28, 1925 5 Smets-Sheet .4

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'nesses: zvent'or:

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Filed March 28, 1925 5 Sheets-Sheet 5 Patented Apr. 17, 1928.

UNITED :STATES Otero sANN, F JoHNs'roWN, PENNSYLVANIA. y

GRINDING MACHINE.

'Application filed. March 28, 1925. Serial No. 19,005.

rl`his invention relates to machines for grinding curvedsurt'aces, and more particularly to a novel form of work supporting table tor such machines, and has tor its object the provision of a table of this class that will have a combined longitudinal and transverse movement relative to a tiXeditool, so that a work-piece on the t-able will be moved through an arcuate path at the point otl contact ot' the tool and said tool will grind an arcuate groove or surface in the work-piece.

Another object is to provide a table ot this class that may be adjusted to have varying degrees of transverse movement, so as to provide tor-grinding grooves having different radii. Y

A further object is to provide a table of this class having the novel design, construction and combination of parts hereinafter described and illustrated in the accompanying drawings.

In the drawings:

Figure 1 is a plan View of a grinding machine table embodying my invention.

Figure 2 is a side elevation thereof.

Figure 3 is a plan view partly broken away to show the table mounting details.

Figures 11, 5, 6, and 7 are sectional elevations taken on the lines IV-IV, V-V, VI-VI, and VIL-VII, respectively.

Figure 8 is an end elevation showing the table and tool or cutting head in their respective positions.

Referringincre particularly to the drawings, the letter A designates the stationary base for the table, and the numeral 2 designates the slidable bed mounted on t-he base A and carrying the work supporting table 3.

The base A is composed of suitable side beam members 4 mounted on a suitable foundation or support 5.- The beams 4 have their upper faces provided with suitable V-shaped grooves 6.

The bed 2 is provided with downwardly projecting rail portions 7, having beveled head portions 7a which tit into the V-shaped grooves 6. The rails 7 serve as bearing supports and guides tor the bed 2, which is adapted to be reciprocated longitudinally of the base A.

The work supporting table 3 is mounted on the bed 2 and is provided with a plurality of inverted T-shaped slots 10 in its top tace for the reception of suitable mounting bolts used to secure or mount the work-piece on the table.

n The table 3 is provided with an` integral pivotbearingsocket 11 adjacent its rear end, which is fitted over a pivot pin 12 mounted on the bed 2. The centers oit-the pivot bearing socket 11 and pin 12 intersect the longitudinal center line or axis oi? the table 3.

A suitable bearing plate 14 is mounted on the underside ot thetable adjacent its forward end and is in sliding contact with a second bearing plate 15 on the bed 2 so as to provide a sliding bearing support for the forward portion oit' the table and permit the table to swing about the pivot pin 12 transversely of the bed 2.

A guide rail 16 having a guide flange 17 is slidably supported along one side of the table 3 on'braclets 1S secured to the base A and to the foundation 5. A bracket arm 19 is secured to the rail 16 and extends under the base A and is mounted von a pivot pin 20 depending trom a cross member 21 extending between the beam members -1 olf the base. `The centerrot the pivot pin 2O intersects the longitudinal center line or axis of the table The brackets 18 are provided with inverted T-shaped yslots 22 in their head portions- 23, which -slots extend in a` direction transversely of the bed 2, and in which are mounted suit-able headed bolts 241 which extend through elongated openings or slots 25 in the guide rail 16, which slots extend in a line parallel with the longitudinal laxis of the rail. The boltsV 211 are provided with suitable nuts 261l which are adapted to betightcned to lock the rail in adjusted positions.

A guide arm 27 has one end pivotally,V

mounted on a pivot piu 28 secured in the table 3 with its center intersecting the longitudinal center line or axis ot the table, at a point spaced from the iiree forward end of said table a distance equal to the distance that the pivot pin 12 is spaced trom the rear or pivot supported end ot the table. The other end of the arm 27 is provided with a guide head 29 which is fitted over the guide fiange 17 out the rail 16.

In operation the `guide rail 16 is adapted to be moved about the pivot pin 20 and locked in an angular position relative to the longitudinal axis of the table 3. The table is then reciprocated by reciprocating the bed and as the bed and table reciprocate, the table 3 will be swung about the pivot pin 12 so as to move transversely of the bed 2 due to the pull ot the guide'arm 27 as 1t travels along the angularly positioned guide rail 16.

The combined longitudinal movement and transverse swinging movement of the table 3 will thus cause the Work-piece secured to the table to be moved through an arcuate path at the point ol contact ot the work-piece with a fixed tool, to be described, so thatv said tool will cnt an arcuate groove or path in the Work-piece.

Any suitable tool supporting structure and tool may be provided for cutting the arcuate grooves or surfaces on the Workpiece. In the drawings, Figure 8, I have shown a tool bridge B comprisingl upright side members 30 and a transverse bridge member 31. A suitable tool head 32 is slidably mounted on the side members 3() and adapted to be moved laterally thereof. The tool head 32 is provided with a motor 33 which is operatively connected by a belt 33 to a tool operating shaft 34, which shaft in the present construction arries agrinding Wheel 35 adapted to grind the groove or surface in a workpiece.

While this machine is primarily adapted for grinding or cutting arcuate grooves in track structures such as switches, crossings and the like, it will be understood that I do not Wish to be limited to such use, and that various tools may be substituted for the grinding Wheel 35 to cut the arcuate grooves Vor surfaces in any form of Work-piece.

I claim:

In a machine for cutting curved or arcu- 'ate grooves or paths in a Work-piece, a stationary base member, a bed slidably mounted on said base and adapted to be reciprocated longitudinally thereof, a work supporting table mounted on said bed, said tableV being'pivotally connected to said bed adjacent one end and slidably supported on said bed adjacent the other end whereby said table may be swung about said pivot transversely ot' said bed, a tool mounted above Y said table, a guide rail extending along'one side ot and longitudinally ot said bed and arranged at an angle to the longitudinal axis of said bed, a bracket arm tor supporting said guide rail, said bracket arm having one end xedly secured to said guide rail intermediate its ends and having its other end pivotally mounted on a liXed pivot pin Whose Acenter line intersects the longitudinal center' line or axis ot said bed, means for moving said rail about said pivotal mounting ot' 4said bracket arm, means for locking said rail in adjusted positions, and a guide arm mounted to travel along said rail, said arm lbeing pivotally connected to said table at a point spaced from the slidably supported endI o the table a distance equal to the distance the pivotal mounting of the table is trom the opposite end of the table, whereby said table -Will be swung transversely ot' said bed as said bed. and table are reciprocated longitudinally so as to cause the tool to cut an arcuate path in the Workepiec'e carried by said table.

In testimony Whereojt, I have hereunto set In hand.A

y OTTO SANN, 

